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A limited edition Oyster card has been produced to mark the royal wedding

A special edition Oyster Card has gone on sale to mark next week's royal wedding.

The electronic smartcard used on London's public transport system features a portrait of the couple and the wedding date of 29 April 2011.

About 750,000 royal wedding Oyster cards will be available from all London Underground and London Overground stations.

The cards were launched in 2003 and now have more than seven million users.

The £5 deposit and £5 minimum top-up will apply as normal for the limited edition card.

National Rail customers will only be able to get the limited edition card at stations where they can currently get an Oyster card.

'Fabulous memento'

The marriage of William's parents, the Prince of Wales and Lady Diana Spencer, in 1981 was also marked by the transport authority of the day with a special ticket.

Peter Hendy, London's Transport Commissioner, said: "London's transport network will play a key role in helping people travel to the wedding celebrations, so it is appropriate that we commemorate the day with a limited edition Oyster card.

"This is the first time we have produced a limited edition Oyster card and I'm sure they will be a hugely popular souvenir of the day while ensuring Londoners and visitors get the cheapest fares for their journeys."

Mayor of London, Boris Johnson, said the commemorative Oyster card was a "fabulous memento" of the wedding for both Londoners and visitors.

"I would also recommend the card to the happy couple as the cheapest, easiest way of getting around this city, especially as it bears their resemblance," he said.